Title :
A nonuniform modulated complex lapped transform
Author :
Xiong, Zixiang ; Malvar, S.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
A nonuniform modulated complex lapped transform (NMCLT) is introduced in this paper as a two-stage extension of the modulated complex lapped transform (MCLT). The NMCLT is a new nonuniform oversampled filter bank with a better combination of time- and frequency-domain localization than previous designs, Adaptive nonuniform subband decompositions can be easily generated by varying the number of coefficients brought to the second stage on a frame-by-frame basis. The NMCLT is ideally suited for processing wideband signals such as audio, with reduced time-spreading artifacts.
Keywords :
adaptive signal processing; audio signal processing; channel bank filters; modulation; transforms; MCLT; NMCLT; adaptive nonuniform subband decompositions; audio; frequency-domain localization; modulated complex lapped transform; nonuniform modulated complex lapped transform; nonuniform oversampled filter bank; reduced time-spreading artifacts; time-domain localization; wideband signals; Audio coding; Digital audio players; Discrete cosine transforms; Discrete transforms; Filter bank; Frequency; Merging; Switches; Time domain analysis; Wavelet packets;
Journal_Title :
Signal Processing Letters, IEEE
